As this stand-alone recorder/mixer has not even been released yet, you won't see any user reviews.
Looking over the details, it has the same advantages and disadvantages that other stand-alone recorders have.
PROs:
1) No computer needed - until you need to send the output somewhere, like a CD or the web.
2) Live mixer use - this seems like a good choice when you want a mixer that also record the band when playing, however see CON #1
Cons
1) Can only record 8 tracks separately - if you've got a whole band plugged into this, you'll have to bus some inputs onto the same track (assume it can do this)
2) SD card memory - can be fiddly, and are tracks saved in a format easy to transfer and use on a computer?